Machine for making metal plates.



H. 0. DAVIDSONA MACHIlNE FOR MAKING METAL PLATES. APPUCANON`FHED MAY8.I9I&

Patented Apr. 22,1919.

2 SHEETS-SHEET1 www H. O. UAVlDSON.

MACHINE FOR MAKING METAL PLATES. APPLICATION FILED MAY 8. 191s.

LSL., l Patented L .22,1919.

2 SH #SHEET 2.

enrrnn srarns naranr cierren nAnnY 0. Davrnson, or CLEVELAND, onio.

MACIINE FOR MAKING METAL PLATES.

Leonesa Specification of Letters Patent.

Patented Apr. 22, i949.

pplcatn filed May 8, 1915. Serial No. 26,918.

Areference `being had to the accompanying drawings.-

This invention relates tov machines for making pressed metal plates, and more particularly to machines for making pressed metal liner plates which are used in the construction of concrete forms for tunnels and similar curved excavations and objects. Heretofore metallic plates for' this purpose have been leither" made of cast metal or have been built up of several parts. It is one of the objects of this invention to provide a machine for forming integral plates of pressed metal each of which plates includes not only a supporting surface for the grouting or coi'icrete material but the flanges whereby the plate may' be secured to adjoining plates. Further and more limited objects of the invention will appear hereinafter in the specification, will be illustrated in the drawings forming part hereof, and will be set forth in the claims hereto anneX'ed. c

Referring to the drawings forming part hereof, Figure 1 represents a sheet metal blank, the dotted lines thereon showing the shape and condition of the blank after' the lir'st operation; Fig. 2l aperspective view showing 4the completed plate; Figs. 3 and 4 are transverse vs'ectiornal views through the machine for making the plate, Fig. 3 showing the position of the plate and the parts prior to the pressing ope-ration and Fig. 4 showing the position o'f the plate and parts at the end of the pressing operation; and Fig. 5 is a View, partly in section and partly in elevation, of the machine or tool.

Describing by reference characters the various`parts illustrated herein and with particular reference to Figs. 1 2, A cle- `notes a rectangular sheet of metal from which the liner plate is to be produced. This sheet will be made of ample size to enable the blank for the liner plate to be struck therefrom but with a minimum waste of nietal. The blank proper, which is formed by a single punching operation, consists of a body defined by the dotted boundary lines al: 02a as Mld G4; il? being i noted that the corners of the sheet are cut away, as indicated at c5, whereby the ends and sides of the blank may be bent thereby to form corresponding walls or flanges in the finished plate, the blank being bent along i the dotted lines a0. At the same time that the blank is thus shaped, perforations a are punched in what will be the flanges of the plate, said perforations affording means whereby the plate may be secured to adjacent plates. The blank thus prepared is subjected to a bending operation whereby it is concaved in the direction of the major aXis and given a cylindrical contour. For

convenience of description, the portions bounded by a", al and a0, c3 will be referred to as sides while the portions bounded by the lines a0, a2 and a0, a4 will be referred to as ends. With the machine shown herein, the bending of the plate into the shape 0f a cylindrical segment and the flanging of the ends and sides will be accomplished in one operation, the flanges at the ends being bent in each in the direction of a plane extending through the axis of such cylinder while the flanges at the sides are bent merely at right angles to the plate.

I will now describe the punch press by means of which the blank just described isy v l denotes a bed given its finished shape. plate which supports the die, the bed plate being provided with a depression for the die plate 2 having the concaved upper surface 3, the concavity being preferably in the shape of a cylindrical segment. Within the bed plate and at each end of the die plate 2 there is mounted a roller 4, each having an angular recess extending longitudinally thereof, one wall 5 of such recess being adapted to formA a continuation of the curved surface 3 of the die plate 2 while the other wall 6 extends at right angles to such curved surface-that is to say, radially with respect to the cylindrical surfaces 3 and Y of the dieplate. Each side of this punch is provided with a recess extending upwardly from the lower end thereof, one wall 9 of such recess being outwardly and upwardly inclined and the top wall l0 being preferably straight or of any suitable shape to form an abutment for a block 11 which is slidably mounted within such recess. As shown in Fig. 4, the block 11 is v substantially trapezoidal in section and the recess is so shaped as to receive the block when in its elevated position, the lower surface l2 of the block being curved and the block being of such dimensions that, when its upper wall is in engagement with the wall 10 of the recess, the lower wall 12 forms a continuation of the curved surface 8 of the main body of the punch. Each block is slidably mounted in its recess, as by means of a machine bolt 13 which extends through a vertically elongated slot 14 in the block and is threaded into the body of the punch. The head of the bolt will be countersunk within the outer side wall 15 of the block, which outer side wall extends radially with respect to the surface 12.

With the parts constructed and arranged as described, the operator places the blank a on top of the rollers 4:, the edges of the blank extending across the recesses in the rollers, as shown in Fig. 3. The blocks 1l will be in the position shown in Fig. 3 but, upon impact against the plate, these blocks will slide up the inclined walls 9 of the recesses until the upper walls of the blocks abut against the walls l0 of the recesses, whereupon the blocks form a continuous curved surface with the lower face of the punch. As the punch descends, the body of the plate will be given a concaved form and, as the blocks enter the recesses in the rollers, the rollers will be rotated inwardly or toward each other and the ends of the blank will be bent upwardly and radially by reason of the shape of these recesses and the rotation of the rollers. At the same time, the sides will be bent at right angles to the body by reasonl of the shape of the die recess in the bed plate, as shown more particularly in Fig. 5. v

As the punch moves upwardly, the blocks 11 drop downwardly upon the machine bolts, riding downwardly and inwardly along the inclined surfaces 9, and thus enabling the punch to be withdrawn to clear the work.

Having thus described my invention, what I claim is:

l. In a machine or tool of the character described, the combination of a die having a concave surface and a roller at each end of said surface, each of said rollers having a recess therein, one wall whereof is adapted to form an extension of the concave die surface and the other wall whereof extends at substantially right angles to such concave wall, a punch coperating with the die and having a convex surface complementary to a portion of the concave surface ofthe die and provided at each end of such surface with a recess having a surface which is inclined downwardly toward the central portion of the die and with a stop above such inclined surface, and a block slidably mounted in each recess and each adapted to move along the corresponding inclined surface of its recess and each being arranged to constitute an extension of the convex surface of the punch when in engagement with its stop, each of said blocks also having a wall extending at substantially right angles to the convex surface thereof and coperating with the corresponding wall of its roller.

2. In a machine or tool of the character described, the combination of a die having a conc-ave surface provided at opposite endsl thereof with rollers, each having a recess therein, one wall whereof is adapted to constitute an extension of the curved surface of the die and vthe other wall whereof extends substantially at right angles to such curved wall, a punch having a convex surface coperating with a portion of the curved surface of the die and having at each side thereof an extension movably connected thereto, each of said extensions being provided with a wall adapted to form a continuation of the convex surface of the punch and with a wall extending at substantially right angles to such curved wall, and means for limiting the outward movement of said extensions.

3. In a machine of the character described, the combination of a concave die, a roller at each end of said die having a recess therein one wall whereof is adapted to form an extension of the concave surface of the die and the other wall whereof Vextends at substantially right angles to such concave wall, a punch coperating with the said die and having a convex surface cooperating with a portion of the concave surface of the die and having at each end of such surface an extension movable outwardly away from and inwardly toward the axis of the punch, each extension being provided with convex surface adapted, when such extension is in its extreme outward position, to, form Ya continuation of the convex surface of the die, and each extension also having a wall extending at substantially right angles to the convex surface thereof.V Y p 4. In a machine of the character described, the combination of a Vdie having a concave surface and rocking extensions thereof each provided with a surface adapted to form a continuation of the concave surface ofthe die and with a surface at substantially right angles to such concave surface, a punch having a convex surface cooperating with the convex surface of the die and having at each side thereof an extension movably connected thereto, each extension having a convex surface adapted to form a continuation of the convex surface of the punch and a surface extending at subtantially right angles to such convex surace.

5. In a machine of the character described, the combination of a die having concave surface and rocking extensions thereof each provided with a concave surface adapted to form a continuation of the concave surface of the die and With va surface extending at substantially right` angles from such concave surface, a punch having a convex surface adapted to coperate Witha portion of the convex surface of the die and having at each side `thereof an extension, such extension having a convex surface adapted to form a continuation of the convex surface of the Apunch and a surface extending at substantially right angles to such convex surface, and means connecting said extensions to said punch and permitting the said extensions to move inwardly toward and outwardly away from the axis of said punch.

6. In a machine of the character described, the combination of a die having a concave surface and a rocking extension at each end of such surface, each extension having a concave surface adapted to form a continuation of the concave surface of the die and a' surface extending at substantially right angles therefrom, a punch having a convex surface coperating with a portion of the concave surface of the die and provided at each end thereof with a guideway Which is inclined toward the axis of said punch, and an extension slidably mounted on each guideway and having a surface adapted to form a continuation of the convex surface of the punch and a surface extending at substantially right angles therefrom.

7. In a machine of the character described, the combination of a die having a curved surface and a rocking extension at each side of such surface, each extension having a wall adapted to constitute an extension of the curved surface of the die and with a wall extending at an angle With respect to the first mentioned Wall, a punch having a surface curved complementarily to the curved surface of the die and having an extension at each end of such surface, each extension having a wall shaped to constitute an extension of the curved punch surface and a wall coperating with the second Wall of the corresponding rocking extension of the die, and means connecting the punch extensions to the punch and permitting relative movement between such extensions and the punch at an angle with respect to the axis of said punch.

8. In a machine of the character described, the combination of a die having a concave surface and a rocking extension at each side of such surface, each extension having a wall adapted to constitute an extension of the concave surface of the die and with a wall extending at an angle with respect to the first mentioned Wall, a punch having a convex surface curved complementarily to the convex surface of the die and having an extensionv at each end of such surface, each extension having a wall shaped to constitute an extension of the convex punch surface and va Wall cooperating with the second wall of the corresponding rocking extension of the die, means connecting the punch extensions to the punch and permitting the punch extensions to move out wardly and away from and inwardly toward the axis of the punch, and means for limiting such outward movement.

In testimony whereof, I hereunto aix my signature.

HARRY O. DAVIDSON.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. f 

